Malicious PDF — malware analysis report

Static analysis result for SHA-256 81710135c65d787f…

MALICIOUS

PDF

116.9 KB Created: 2021-03-06 04:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 229bd60ab91d6ecca069ebfec7036f07 SHA-1: cde006117c5df079035df0a465e9f56b7c54e66b SHA-256: 81710135c65d787f741b2c866134385cf24c042a2a6515ff540c5264c81fc94e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL suggesting a lure for a questionnaire, likely to facilitate the download of a second-stage payload. The presence of multiple disposable domains and link farms further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/123?utm_term=attachment+style+questionnaire+versione+italiana+pdf PDF link annotation
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/625348.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/wevakuj-gisale.pdfIn PDF document text
    • http://dektesheff.xyz/ceratitis_cosyraqrdsd.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/7876174.pdfIn PDF document text
    • http://huseyincanx.com/wafikisevawuv62az.pdfIn PDF document text
    • http://parkingtest.xyz/maya_2021_release_date2pbl5.pdfIn PDF document text
    • http://bullbananavannaone.xyz/75725452705l1stk.pdfIn PDF document text
    • http://help-igcopyright.xyz/521817942795zyvp.pdfIn PDF document text
    • http://fotobaruti.22web.org/rirekanojimomum.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/fm_approval_guide.pdfIn PDF document text
    • http://zotokes.iblogger.org/almighty_infinite_father_song.pdfIn PDF document text
    • http://rivifosa.iblogger.org/descriptive_survey_thesis.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/puxabatenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sirirowevaga.rf.gd/lekome.pdfIn PDF document text
    • http://jusowegakero.epizy.com/vcf_format_header.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/pokemon_alola_region_game_gba.pdfIn PDF document text
    • http://majazizekor.epizy.com/ableton_software_free.pdfIn PDF document text
    • http://gedaseda.rf.gd/mid_android_tablet_9_inch.pdfIn PDF document text
    • http://xasagode.myartsonline.com/dugiwefeweg.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/ubuntu_condensed_font_free.pdfIn PDF document text
    • http://tetirapop.epizy.com/google_chrome_for_pc_free.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/sandisk_sansa_e280_8gb_mp3_player.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18818 5672 bytes
SHA-256: 3184e57832a0300eb13864e83d076b9283f8d03dc65f287f29de24cb8b567d5e
font_01_sfnt_off00019b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B4C 13000 bytes
SHA-256: 77062da90f7d3723a0eb164cc2a536b2dc7c72f98ca14dec9babbf308d6103b3

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